The mega-bestseller that launched a global phenomenon is back - now as a graphic novel!Minutes before she died Grace Cahill changed her will, leaving her descendants an impossible decision:"You have a choice - one million dollars or a clue."Grace is the last matriarch of the Cahills, the world's most powerful family.Everyone from Napoleon to Houdini is related to the Cahills, yet the source of the family power is lost.Now the clues race is on, and young Amy and Dan must decide what's important: hunting clues or uncovering what REALLY happened to their parents.part book, part online game, 100% fun.the perfect gift for kids who think they don't like reading!Rick Riordan is the #1 New York Times bestselling author of the Percy Jackson and the Olympians series